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Kamala Jayanthi, P. D.
- Ovipositional Responses of Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) to the Presence of Prey, Maconellicoccus hirsutus (Green)
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Authors
Affiliations
1 Division of Entomology and Nematology, Indian Institute of Horticultural Research, Hesseraghatta, Bangalore 560 089, Karnataka, IN
1 Division of Entomology and Nematology, Indian Institute of Horticultural Research, Hesseraghatta, Bangalore 560 089, Karnataka, IN
Source
Journal of Biological Control, Vol 26, No 3 (2012), Pagination: 240-244Abstract
Studies to understand the influence of prey-specific cues on the clutch size of predatory coccinellid, Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) were carried out under laboratory conditions to determine factors which act as positive ovipositional cues to the female. Correlation analysis between the clutch size and the oviposition time indicated that the clutch size is influenced by prey specific cues like prey eggs and honeydew. The regression analysis also explained the maximum variability in the clutch size in the presence of prey specific cues viz., prey eggs along with honeydew (y = 0.2725x + 3.5593; R2 = 0.8742; 0.94**); prey eggs along with exuviae and honeydew (y = 0.2865x + 3.2844; R2 = 0.8384; r = 0.92**) and prey eggs alone (y = 0.257x + 3.7467; R2 = 0.7805; r = 0.88**). The study indicated that prey specific cues like prey eggs and honeydew serve as positive ovipositional cues for gravid C. montrouzieri.Keywords
Predator, Coccinellid, Cryptolaemus montrouzieri, Clutch Size, Prey Specific Cues.Full Text
References
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- Feeding and Fecundity in the Predator, Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae)
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Authors
Affiliations
1 Department of Entomology and Nematology, Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore 560089, IN
1 Department of Entomology and Nematology, Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore 560089, IN
Source
Journal of Biological Control, Vol 29, No 1 (2015), Pagination: 14-19Abstract
The relationship of food consumption during the grub stage with the subsequent adult stage of female Cryptolaemus montrouzieri (Coleoptera: Coccinellidae), and the impact of food consumption on its fecundity was studied. Food consumption of the adult female C. montrouzieri was found to be positively correlated with food consumption during the grub stage and the regression analysis explained 54% of the variability (y = 0.3418x + 1.3884; R2 = 0.542). Further, fecundity was found to be linked to the adult female's food consumption with a highly significant positive correlation to consumption of previous 1st day (r = 0.83), 2nd day (r = 0.82), 3rd day (r = 0.81), 1st + 2nd day (r = 0.83), 2nd + 3rd day (r = 0.82) as well as to cumulative food consumption (r = 0.83). Linear and non-linear functions explained the relationship between amount of food consumed and numbers of eggs laid to the extent of 85% (y = 1.6075x + 46.8; R2 = 0.8456) and 89% (y=15.198x0.5681; R2 = 0.8854), respectively. Thus, selection for high food consumption in the grub stage also selects indirectly C. montrouzieri adult females that lay copious quantities of eggs.Keywords
Cryptolaemus montrouzieri, Feeding, Fecundity, Life Stages.Full Text
- Behavioural Response of Specific Larval Endoparasitoid, Apanteles machaeralis (Wilkinson) to Volatile Cues from its Host Insect, Diaphania indica (Saunders) and the Host Plant (Cucumis sativus L.)
Abstract Views :240 |
PDF Views:120
Authors
Affiliations
1 Department of Entomology, University of Agricultural Sciences, Bangalore – 560065, Karnataka, IN
2 Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore – 560089, Karnataka, IN
1 Department of Entomology, University of Agricultural Sciences, Bangalore – 560065, Karnataka, IN
2 Division of Entomology and Nematology, ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake PO, Bangalore – 560089, Karnataka, IN
Source
Journal of Biological Control, Vol 34, No 2 (2020), Pagination: 132-139Abstract
Apanteles machaeralis (Wilkinson), a braconid specialist larval endoparasitoid of Diaphania indica occurs naturally causing significant levels of parasitism. The present study explores the response of the A. machaeralis to odour cues from D. indica damaged cucumber plant as well as host larvae. Different odour treatments namely, D. indica larval body volatiles (T1), volatiles from larval excreta (T2), volatiles from larvae + excreta (T3), volatiles from D. indica body wash (T4), volatiles from the healthy, mechanically damaged and D. indica infested cucumber plants (HIPVs) were collected using headspace analysis and the response of female A. machaeralis was studied using olfactometer assays. Results of the study conclusively indicated that A. machaeralis is highly attracted to host larval body wash as parasitic wasps spent significantly more time made more entries into the treated region in single as well as dual choice assays. The electoantennographic response (EAG) further supported the olfactometer bioassays. The GC-MS analysis revealed significant differences in the volatile emissions of different treatments studied. The utilization of host insect body cues and HIPVs in the host recognition by the specialist endoparasitoid A. machaeralis is discussed in detail.Keywords
Cucumber Moth, HIPVs, Olfactometer Assays, Specialist Parasitoid, Volatiles.Full Text
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